Xigmatek Dark Knight

I've seen this heatsink in alot of videos and they were all in different directions. I was wondering if it could be set in any direction without any modification or does it have a default one. Wanting to put this on an AMD Phenom II processor.

Alright thanks alot, I'd seen an NZXT apollo with the fan pointing up just thought it would go up into the PSU and blow it out from the rear. Anyways thanks I like how it looks sideways though so I'll try that.

AMD's mounting system only allows you to mount it horizontally, so the air is directed towards the top of the case. Like this:

If you want to mount it so that the air is directed towards the back of the case (see pic below), you will either need to:

a.) Buy a custom bracket, which can be found here. I have one of these for my Xiggy S1283, which is the same thing as the Dark Knight. It works very well. You will also need four 6/32 1/4" machine screws to mount the heatsink to the backplate. These can be found at your local hardware store for under a dollar.

b.) Modify the socket 775 brackets that came with your cooler, and use them with the Enzotech Type-X. Instructions can be found here.

If I were you I'd go with the first option, it proved to be much easier for me compared to the second option (which I tried as well).

If there are holes at the bottom of the PSU mount (bottom mounting cases), then the PSU draws the cool air from the outside and exhausts it out the back of the case. If you mount the PSU with the fan up, it draws in the hot air from inside the case and exhausts it out the back. It is fine either way, I would just think that drawing in hot air from inside the case is never a good idea for the PSU because it could result in overheating. Fans on PSU's generally intake air and that air is blown over the components inside the PSU unit and then exhausted out the back.